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When's the autumnal equinox in 2017?

In 2017, the autumnal equinox will be on Friday, September 22.

The precise moment when the sun crosses the equator wll be at 8.02pm Universal Time (the same as Greenwich Mean Time) and as we are in British Summer Time, it will be an hour ahead of that at 9.21pm in the UK. The sun will have set in the UK by that time, so equinox wiill happen when it's below our horizon.